JSON Canvas MCP Server

A remote Model Context Protocol server for working with JSON Canvas files — the open infinite-canvas format used by Obsidian. Create, validate, read, edit, export, and search .canvas files, with an inline interactive canvas viewer.

Hosted by MCPCentral at https://jsoncanvas.mcpcentral.io/mcp (Streamable HTTP). This repository is the public listing for the MCP Registry; the server itself is closed-source.

<!-- Registry validation marker — must match server.json name. --> mcp-name: io.mcpcentral/jsoncanvas

Authentication

The endpoint requires Microsoft Entra OAuth via the MCPCentral gateway (login.mcpcentral.io). MCP clients perform the standard OAuth flow automatically: an unauthenticated request returns 401 with a WWW-Authenticate pointing at the RFC 9728 metadata at /.well-known/oauth-protected-resource, and the client takes you through sign-in. Canvases are stored privately per authenticated user.

Client configuration

Claude Code

claude mcp add jsoncanvas --transport http https://jsoncanvas.mcpcentral.io/mcp

Claude Desktop / other clients via mcp-remote

{
  "mcpServers": {
    "jsoncanvas": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://jsoncanvas.mcpcentral.io/mcp"]
    }
  }
}

Any MCP client that supports remote Streamable HTTP servers with OAuth (Claude, Goose, OpenAI connectors, MCP Inspector) can connect.

Tools

Tool	Description
create_canvas	Create a canvas from nodes (+ optional edges); stored under a date-prefixed .canvas name.
validate_canvas	Validate canvas data against the JSON Canvas 1.0 spec.
read_canvas	Read a stored canvas and return its nodes and edges.
list_canvases	List your stored canvases.
edit_canvas	Atomic batch add/update/remove of nodes and edges (removing a node cascades its edges).
export_canvas	Export to markdown, svg, mermaid, or png (full-fidelity raster via Browser Rendering).
search_canvases	Case-insensitive field-level search across your canvases.

create_canvas, read_canvas, and edit_canvas carry MCP Apps UI metadata so supporting hosts render the result inline in an interactive pan/zoom viewer.

Resources

• canvas://schema — JSON Schema for canvas files.
• canvas://examples/basic — a simple two-node example canvas.
• ui://canvas/viewer.html — the interactive read-only viewer (MCP Apps UI).

Security

• Per-user isolation — every canvas is scoped to the authenticated user; no cross-user reads.
• Auth required — all tool calls require a valid Entra-issued bearer token.
• Hardened — strict input/size caps, bounded search, accurate tool annotations, and an SSRF-blocked PNG renderer (the headless browser cannot be coerced into outbound requests).
• Report vulnerabilities per SECURITY.md. Please do not open public issues for security reports.

License

MIT.